NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 641
WINDSTREAM IOWA COMMUNICATIONS, INC. 60
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 46
UNITED STATES CELLULAR - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 32
QWEST CORPORATION 30
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 641-364 0XXX3XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ALTA VISTA IA
— 641-366 0XXX6XXX7XXX8XXX · 4 holders which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 CONRAD IA
— 641-369 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BRIDGEWTR IA
— 641-377 6XXX which blocks → COLO TEL. CO. 1134 COLO IA
— 641-380 not yet reported which blocks → QWEST CORPORATION 9631 MASON CITY IA
— 641-381 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 NORTHWOOD IA
— 641-385 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 COLLINS IA
— 641-390 4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 NORTHWOOD IA
— 641-393 0XXX3XXX4XXX5XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ELMA IA
— 641-394 7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWHAMPTON IA
— 641-395 not yet reported which blocks → FARMERS MUTUAL TEL. CO. NORA SPRINGS 1172 RUDD IA
— 641-396 not yet reported which blocks → FMTC-I35, INC. D/B/A OMNITEL COMMUNICATIONS 1209 ST CHARLES IA
— 641-397 3XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MARBLEROCK IA
— 641-398 not yet reported which blocks → FARMERS MUTUAL TEL. CO. NORA SPRINGS 1172 FLOYD IA
— 641-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 641-414 2XXX3XXX8XXX9XXX which blocks → UNITED STATES CELLULAR - IA 6266 OSCEOLA IA
— 641-416 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PELLA IA
— 641-417 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 NEWTON IA
— 641-420 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MASON CITY IA
— 641-421 not yet reported which blocks → QWEST CORPORATION 9631 MASON CITY IA
— 641-422 not yet reported which blocks → QWEST CORPORATION 9631 MASON CITY IA
— 641-423 not yet reported which blocks → QWEST CORPORATION 9631 MASON CITY IA
— 641-424 not yet reported which blocks → QWEST CORPORATION 9631 MASON CITY IA
— 641-425 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 MASON CITY IA
— 641-426 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CHARLES CY IA
— 641-427 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BAGLEY IA
— 641-429 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 JAMAICA IA
— 641-430 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 MASON CITY IA
— 641-431 2XXX6XXX8XXX · 3 holders which blocks → UNITED STATES CELLULAR - IA 6266 YALE IA
— 641-435 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 NASHUA IA
— 641-437 2XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CENTERVL IA
— 641-439 not yet reported which blocks → PANORA COMMUNICATIONS COOPERATIVE 1271 YALE IA
— 641-442 5XXX6XXX which blocks → GRAND RIVER MUTUAL TEL CO 1888 DAVIS CITY IA
— 641-443 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 GARDEN GRV IA
— 641-444 1XXX2XXX6XXX9XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 BELMOND IA
— 641-445 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 WELDON IA
— 641-446 0XXX which blocks → GRAND RIVER MUTUAL TEL CO 1888 LEON IA
— 641-447 not yet reported which blocks → SOUTH CENTRAL COMMUNICATIONS, INC. 1094 MURRAY IA
— 641-449 2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 NEWVIRGINI IA
— 641-452 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 UNIONVILLE IA
— 641-454 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 MANLY IA
— 641-456 6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 HAMPTON IA
— 641-458 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 GENEVA IA
— 641-459 not yet reported which blocks → CITIZENS MUTUAL TELEPHONE COOPERATIVE 1129 FLORIS IA
— 641-464 5XXX6XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MOUNT AYR IA
— 641-466 2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LIBERTYCTR IA
— 641-469 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-470 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-472 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-473 0XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GLADBROOK IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.